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Income Tax - Effective Tax Rate (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Income Tax Disclosure [Abstract]        
(Provision) benefit for income taxes $ (40) $ (41) $ (121) $ (90)
Effective tax rate 25.00% 32.00% 31.00% 28.00%